package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.OrderService;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import com.sky.websocket.WebSocketServer;
import io.swagger.models.auth.In;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderService orderService;
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     *
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> datelist = new ArrayList<LocalDate>();

        datelist.add(begin);

        while(!begin.equals(end))
        {
            //日期计算，计算指定日期的后一天日期
            begin = begin.plusDays(1);
            datelist.add(begin);
        }

        //存放每天营业额
        List<Double> turnoverList = new ArrayList<>();
        for(LocalDate date : datelist)
        {
            //查询每一天的营业额数据，状态为“已完成
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);

            //select sum(amount) from orders where order_time > beginTime and order_time <endTime and status = 5
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnoverList.add(turnover);
            turnover = turnover==null?0.0:turnover;
        }

        //封装结果
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(datelist,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     *
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
      public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
          //当前集合用于存放从begin到end范围内的每天的日期
          List<LocalDate> datelist = new ArrayList<LocalDate>();

          datelist.add(begin);

          while(!begin.equals(end))
          {
              //日期计算，计算指定日期的后一天日期
              begin = begin.plusDays(1);
              datelist.add(begin);
          }

          //存放每天新增用户数量
          List<Integer> newUserList = new ArrayList<>();
          //存放每天总用户数量
          List<Integer> totalUserList = new ArrayList<>();

          for(LocalDate date : datelist){
              LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
              LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);

              Map map = new HashMap();
              map.put("end",endTime);

              //总用户数量
              Integer totalUser = userMapper.countByMap(map);

              map.put("begin",beginTime);
              //新增用户数量
              Integer newUser = userMapper.countByMap(map);

              totalUserList.add(totalUser);
              newUserList.add(newUser);

          }

        //封装结果数据
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(datelist,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> datelist = new ArrayList<LocalDate>();

        datelist.add(begin);

        while(!begin.equals(end))
        {
            //日期计算，计算指定日期的后一天日期
            begin = begin.plusDays(1);
            datelist.add(begin);
        }
        //存放每天订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历dateList集合，查询每天的订单数和有效数
        for(LocalDate date : datelist){
            //查询每天订单数
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime,endTime,null);

            //查询每天有效订单数
            Integer validOrderCount = getOrderCount(beginTime,endTime,Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0)
        {        //计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(datelist,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 统计指定时间区间内的销量前10名
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime,endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names,",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers,",");

        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     */
    public void exportBusinessData(HttpServletResponse response) {
        //查询数据库，获得最近三十天的数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin,LocalTime.MIN),LocalDateTime.of(dateEnd,LocalTime.MAX));

        //通过poi将数据写入到excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //获取sheet页面
            XSSFSheet sheet = excel.getSheet("sheet1");
            //填充数据-时间
            sheet.getRow(1).getCell(1).setCellValue("时间"+dateBegin+"至"+dateEnd);

            //获取第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());


            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData=workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN),LocalDateTime.of(date,LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(i+7);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //通过输出流将excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            out.close();
            excel.close();

        }catch (IOException e){
            e.printStackTrace();
        }
    }

    /**
     * 根据条件统计订单数量
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end,Integer status) {
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);

        return orderMapper.countByMap(map);
    }

    
}
